Friction-locked grease-cup.



E. TYDEN.

FRICTION LOCKED GREASE CUP.

APPLICATION FILED APII. 20` 191e.

l ,@QQBQI @Patented @am 25, 191?.

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EiVriL TYDEN, or vAnstUo'N, ILLINOIS.

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To all whom t may concern.'

Be it known that I, EMIL TYDEN, fa citizen of the United States, andresident of Evanston, in the coufnty of Cook and State of Illinois, haveinvented new and useful Improvements in i Friction-Locked :Grease- Cups,of which the following is a specification, reference being had to theaccompanying drawings, forming a part thereof.

The-purpose of `this invention is to pro-` vide an improved form ofgrease cup which -will be economical inconstruction and especiallyadapted for use insltuations where 1t is subjected to considerablevibration, as is frequently vthe case on motor vehicles. The inventionconsists in the various features Aof construction described and `shownin the drawings as indicated by `the claims.

In thedrawingsy Figure `l is `a side elevation of a grease cuppembodyingthis invention.

Fig. 2 is an enlarged elevation of the base portion showing only afragment of the cap associated therewith.

Fig. 3 is a vertical -section taken as indicated at l-in'e 3-3 on Fig.2.

Fig. 4 is a plan section taken as indicated atline 4 4 on Fig. 2. i y

Fig. 5 is a detail vertical section of a modified construction. x

` This invention is shown applied to a .si-mple form Aof greasecupcomprising a hollow base, l, and a Vhol-low cap, 2, the base bei-ngexternally screw-threaded at l?,` yand the cap being internallyscrew-threaded to i't thereon. `The lower portion of the base istapered` at 1b, to connect with the hollow stem, l?, screw-threaded at1d,for mounting on whatever element of the machinery it is to serve. Itwill .be understood .that the lubricant which initially fills the4entire cavity of the hollow base, l, and falso a portion of the cap, 2,-is fed `through the hollowstem, 1c, by screwing -dowfn the capgradually as the lubricant is required. But where the device issubjected `to heavyvibration there is a constant tendency for the cap tobecome unscrewed by such vibration, land in thecase of its use on atraveling vehicle the cap 4is .thus easily lostoff and dust and grit ad--mittedy to the hollow base, 1, and frequently 'carried by thel-ubricantto the bearing, thus doing great injuryto it. y y

To lprevent such loss ofthe cap, 2, and to resist itstendency to becomeunscrewed unspeircaadn df Leners raient. Pammadsept 25, 191117,Appiieation mee April 2o, 191e. serial No. 92,354.

der vibration, the present Vconstruction provides a spring device, 3,shown as a round wire of approximately semiscircular form disposed justinside the hollow base, 1,' and having an olf-set `portion whichprojects through an aperture, le, near the upper edge of said base.lThis aperture, le, cuts through the thread, la, of said base so that theoiffset, 3F, of the spring, 3, may frictionally engage the internalthread of the cap, 2. To prevent leakage of the lubricant contained inthe base, l, a yseparate chamber is formed for such lubricant in thebase by inserting a lining, 4, which is simply a cylindrical sleevewhose lower edge is forced into contact at 4a, with the tapered bottom,1b, of the base, and whose upper edge is formed with a flange, 4b,reaching across the annular space, 5, for contact with theinner surfaceof the threaded wall, le, and ata point above the aperture, le., in saidwall. This flange, 4b, is a snug fit inthe hollow base, but itspermanent location therein may be` assured by slightly burring down `theupper edge of the base wall, as indicated at lf, on Fig. 3. lIfhus theannular space at 5, .provides adequate room for the spring device 3,while the capacity lof thegrease cup is only slightly diminished by thepresence of the lining, 4.

As an additional precaution against loss oft 'e cap, 2, in case thevibration should be suiiicient to overcome the frictional resistance ofthe spring device, 3, the lower l`edge fof said cap is notched at 2a,and the, olf-set portion, 3a, of thespring member is formed to extendquite abruptly at 3b, across the thread of the base but in a moregradually sloping `direction across said thread at 3c, as shown in Fig.41. The abrupt shoulder, 3b, will engage the edge, 2h, of the notch, 2a,as` the fcap, 2, rotates in ldirection for funscrewing, and suchsubstantially positive engagement of the spring member with said notchwill certainly arrest the rotation of the cap even under very heavyvibration. The sloping portion, 3C, ofthe spring device which is4presented tothe notch, 2a, in screwing on Jthe cap, `2, will not offerany serious resistance to manualrotation ofthe cap in such direction,butwill `simply allow A easy depression of the of-set at 3%to a pointwhere it will merely frictionally engage the threads of the capfollowing the notch,2a. It will be understood that the resistance"offered by the abrupt portion, 31?,

penses with the use of a separate liningf` member, as shown at 4L, inFig. 3. In this modified iorm the shell, lx, of the base is Y- initiallyconstructed with a. thin inwardly projecting flange,l 1y, justbelowwhich there is a groove, 17', of suiiicient size to contain thespring device, 3. Said spring device, 3, having been inserted in thegroove, lz, the b ase may be rotated about its axis on a lathe and theinner edge of the flange, 1y, may be bent over to inclose the spring, 3,as shown in full lines in Fig. 5, the dotted lines indicating theinitial form of `said flange, ly. It will be recognized that thisconstruction is only applicable to -a grease cup which is turned up fromsolid stock on a lathe or automatic screw machine, whereas the principalconstruction illustrated in Figs. l, 2, 3 and ll, may be stamped er drawfrom sheet metal.

As indicated by the dotted fragment of the cap, 2, shown in Fig. 3, thethreaded areaof said cap is considerably greater than the threaded areaof the baseat l, ,and when the cap is screwed down to its lowest limit aportion of its threaded area standing opposite the tapered bot-tom, 1d,of the base, will be exposed to dust and grit, especially if the greasecup is in use on a road vehicle. When the cap is unscrewed some of thisgrit is likely to adhere to the threads and to become` mixed with thenew supply of grease with which the cap, 2, is filled, and thus the gritisv carriedl to the bearingsV and is likely to do them considerableinjury. To prevent this trouble a smallplug of leather orother suitablefibrous material is shown inserted at 6, with its body projectingthrough vthe threaded area, la, of the base forcontact with the internalthreads of thec'ap, 2, so that said threads are wiped clean vas the capis unscrewed and all grit is removed from them. This plug may be formedwith a head, 6a, occupying' a part of the Vannular space, 5, between thevhollow base' wall and its lining, l, and said liningv will thus serveto hold the plug 6, in position. v l #I claimzl'In a grease cupcomprising a cap and base screw-threaded for mutual engagement, one ofsaid parts having an aperture in its threaded wall, a friction memberlin said aperture `positioned for yielding frictional engagementwith thethreads of the other part, and a supplemental wall Jfor the aper turedpart extending'adjacent the aperture but spaced away therefrom toprovide housing room for the spring member.

2. `In a grease cupl comprising a cap and a" hollow base screwsthreadedfor mutual engagement, said' base having an aperture in its threadedwall, a friction member 4in ing roomior the friction member."

- 13; In a grease cup'comprising a cap and a hollow base screw-threadedfor mutual engagement, a lining forsaid hollow base comprising a sleevedimensioned'to inclose an annular space 'immediately within. thethreadedwall of the ybase,-said sleeve extending from the bottom of thebase upward and terminating in a flange reaching outward to the wall forcompleting closure of said annular'space, said threaded wall hav`- ingan aperture anda spring member in said annularspace and projectingthrough said 'aperture f for frictional engagement with'the threads ofthe cap.`

4. Ina grease cup comprising a cap and base screw-threaded for mutualengagement, said base having an aperture near the upper edge of itsthreaded wall, a spring member in said aperture positioned for yieldingfrictional engagement with the threads `of the cap, and a lining wall inthe base extending over the aperture but spaced away there-l from toprovide housing room for the spring member. v l

5. In a grease cup comprising a capand base serewthreaded for mutualengagement, said base having an aperture in its threaded wall, a springmember in said aperture formed to extend through the wall for engagingthe threaded cap, the edge of "said cap having a notch adapted forsubstantially positive engagement with said spring device to prevent theunscrewing of the cap by vibration, and a lining wall in the baseextending over the` aperture but spaced away therefrom to provide forthe spring member.

6. In a grease cup. comprising a cap and base screw-threaded for mutualengagement, said base having an aperture in its threaded wall, a springmember formed with a portion adapted to protrude through such aperture,the cap having a notch in the edge of its threaded wall and saidprotruding part of the spring device being formed to extend abruptlyacross the path of said notch kwhen the cap is unscrewed but presentinga`slop ing face to said notch when the cap is screwed on to the base,wherebysaidv device thevmore strongly resists the unscrewingof thecap.-

7. In asgrease cup comprisinganexternally' screw-threaded base and aninternally threaded cap fitted thereon, the .threaded area of said capextending `farther in axial direction than that of the base, and aheaded plug of yieldingfibrous material set through housing room anaperture in t-he threaded area of said base with its head inside thebase and its body projecting for wiping contact with the threads of thecap.

8.- In a grease cup comprising an externally screw-threaded base and aninternally threaded cap fitted thereon, the threaded area of said capextending farther in axial direction than that of the base, and a headedplug of yielding iibrous material set through an aperture in thethreaded area of said base with its head inside the base and its bodyprojecting for wiping contact with the threads of the cap,'together withan inner lining wall for the base serving to retain the head of the plugin posit-ion therein.

9. In a grease cup comprising two principal members one exterior to theother, screwthreaded for mutual engagement, the interior one of saidmembers having a chamber for the lubricant and a discharge duet leadingtherefrom, and having an aperture in its threaded wall; a device in saidaperture positioned for engagement with the threads of the exteriormember, and means within the chamber of said interior member forpartitioning the aperture away from the remainder of the chamber so asto prevent leakage of lubricant out through said aperture.

10. In a grease cup comprising a cap and a base, screw-threaded formutual engagement, the 'base having a chamber for lubri cant and adischarge duct leading therefrom, said base having an aperture in itsthreaded wall; a device in said base positioned to protrude through theaperture for engagement with the threads of the cap, and means withinthe chamber of the base for partitioning the aperture away from theremaining portion of the chamber to prevent leale age of lubricant outthrough said aperture.

In testimony whereof I have hereunto set my hand at Chicago, Illinois,this 17th day of April, 1916.

EMIL TYDEN.

Copies of this patent may be obtained for `live cents each, byaddressing the Commissioner of Patents,

Washington, D. C.

